Cacodemons

From Homestar Runner Wiki

Pom Pom as a cacodemon

Cacodemons are best known as the floating one-eyed demon foes in the video game Doom. These monsters get occasionally referenced in the Homestar Runner cartoons.

[edit] Appearances

Debut: Email alternate universe — Strong Bad thinks that his alternate universe portal will release cacodemons.
strongbad email.exe Disc Five — If you wait too long to select a toon, a cacodemon appears, and Strong Bad comments on it.
Jibblies 2 — Pom Pom dresses up as a cacodemon for Halloween.